The vice president came prepared with his Costco card. At right: Costco co-founder Jim Sinegal.

Saul Loeb AFP/Getty Images

Yes, he talked about the negotiations over taxes and spending cuts. Yes, it was a holiday photo op. But what really struck us about Vice President Joe Biden's this morning to Washington, D.C.'s first Costco store was how, once again, he just seems to have so much fun.